Security system portal



FIG. 1 is a front perspective view of a security system portal showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines showing details in FIGS. 1 and 5-7 are included for the purpose of showing environmental portions of the security system portal and form no part of the claimed design. 

The ornamental design for a security system portal, as shown. 